Occupational therapists work with children and youth who present with a range of medical, physical, learning, developmental and psychosocial conditions impacting occupational performance and participation. Based on the goals and priorities set with children and families, occupational therapists assess, plan and provide intervention leading to engagement in occupation and enhancing participation. Occupation-centred assessment requires judging, measuring, quantifying, scoring, observing or describing some aspect of occupational performance or the fundamental skills required to engage in occupation (Law & Baum, 2001). Occupational therapy assessment with children and youth ranges from specific to general and from single to holistic issues, all in the context of occupational performance and child- and family- centred practice. Assessment can take place at different stages of the occupational therapy process, such as at initial referral, during the intervention and at follow-up (refer to Figure 7.1 for overview).